oracle函数获取汉字拼音的首字母

CREATE OR REPLACE FUNCTION F_TRANS_PINYIN_CAPITAL(P_NAME IN VARCHAR2) RETURN VARCHAR2 AS

V_COMPARE VARCHAR2(100);

V_RETURN VARCHAR2(4000);



FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 AS

BEGIN

RETURN NLSSORT(P_WORD, 'NLS_SORT=SCHINESE_PINYIN_M');

END;

BEGIN

FOR I IN 1..LENGTH(P_NAME) LOOP

  V_COMPARE := F_NLSSORT(SUBSTR(P_NAME, I, 1));

  IF V_COMPARE >= F_NLSSORT(' 吖 ') AND V_COMPARE <= F_NLSSORT('驁 ') THEN

  V_RETURN := V_RETURN || 'a';

  ELSIF V_COMPARE >= F_NLSSORT('八 ') AND V_COMPARE <= F_NLSSORT('簿 ') THEN

  V_RETURN := V_RETURN || 'b';

  ELSIF V_COMPARE >= F_NLSSORT('嚓 ') AND V_COMPARE <= F_NLSSORT('錯 ') THEN

  V_RETURN := V_RETURN || 'c';

  ELSIF V_COMPARE >= F_NLSSORT('咑 ') AND V_COMPARE <= F_NLSSORT('鵽 ') THEN

  V_RETURN := V_RETURN || 'd';

  ELSIF V_COMPARE >= F_NLSSORT('妸 ') AND V_COMPARE <= F_NLSSORT('樲 ') THEN

  V_RETURN := V_RETURN || 'e';

  ELSIF V_COMPARE >= F_NLSSORT('发 ') AND V_COMPARE <= F_NLSSORT('猤 ') THEN

  V_RETURN := V_RETURN || 'f';

  ELSIF V_COMPARE >= F_NLSSORT('旮 ') AND V_COMPARE <= F_NLSSORT('腂 ') THEN

  V_RETURN := V_RETURN || 'g';

  ELSIF V_COMPARE >= F_NLSSORT('妎 ') AND V_COMPARE <= F_NLSSORT('夻 ') THEN

  V_RETURN := V_RETURN || 'h';

  ELSIF V_COMPARE >= F_NLSSORT('丌 ') AND V_COMPARE <= F_NLSSORT('攈 ') THEN

  V_RETURN := V_RETURN || 'j';

  ELSIF V_COMPARE >= F_NLSSORT('咔 ') AND V_COMPARE <= F_NLSSORT('穒 ') THEN

  V_RETURN := V_RETURN || 'k';

  ELSIF V_COMPARE >= F_NLSSORT('垃 ') AND V_COMPARE <= F_NLSSORT('擽 ') THEN

  V_RETURN := V_RETURN || 'l';

  ELSIF V_COMPARE >= F_NLSSORT('嘸 ') AND V_COMPARE <= F_NLSSORT('椧 ') THEN

  V_RETURN := V_RETURN || 'm';

  ELSIF V_COMPARE >= F_NLSSORT('拏 ') AND V_COMPARE <= F_NLSSORT('瘧 ') THEN

  V_RETURN := V_RETURN || 'n';

  ELSIF V_COMPARE >= F_NLSSORT('筽 ') AND V_COMPARE <= F_NLSSORT('漚 ') THEN

  V_RETURN := V_RETURN || 'o';

  ELSIF V_COMPARE >= F_NLSSORT('妑 ') AND V_COMPARE <= F_NLSSORT('曝 ') THEN

  V_RETURN := V_RETURN || 'p';

  ELSIF V_COMPARE >= F_NLSSORT('七 ') AND V_COMPARE <= F_NLSSORT('裠 ') THEN

  V_RETURN := V_RETURN || 'q';

  ELSIF V_COMPARE >= F_NLSSORT('亽 ') AND V_COMPARE <= F_NLSSORT('鶸 ') THEN

  V_RETURN := V_RETURN || 'r';

  ELSIF V_COMPARE >= F_NLSSORT('仨 ') AND V_COMPARE <= F_NLSSORT('蜶 ') THEN

  V_RETURN := V_RETURN || 's';

  ELSIF V_COMPARE >= F_NLSSORT('侤 ') AND V_COMPARE <= F_NLSSORT('籜 ') THEN

  V_RETURN := V_RETURN || 't';

  ELSIF V_COMPARE >= F_NLSSORT('屲 ') AND V_COMPARE <= F_NLSSORT('鶩 ') THEN

  V_RETURN := V_RETURN || 'w';

  ELSIF V_COMPARE >= F_NLSSORT('夕 ') AND V_COMPARE <= F_NLSSORT('鑂 ') THEN

  V_RETURN := V_RETURN || 'x';

  ELSIF V_COMPARE >= F_NLSSORT('丫 ') AND V_COMPARE <= F_NLSSORT('韻 ') THEN

  V_RETURN := V_RETURN || 'y';

  ELSIF V_COMPARE >= F_NLSSORT('帀 ') AND V_COMPARE <= F_NLSSORT('咗 ') THEN

  V_RETURN := V_RETURN || 'z';

  ELSE 

    V_RETURN := V_RETURN ||SUBSTR(P_NAME, I, 1);

END IF;

END LOOP;

RETURN V_RETURN;

END;

　　

　SELECT F_TRANS_PINYIN_CAPITAL('中华人民共和国')  FROM DUAL